Mixing element



FIG. 1 is a perspective view of a design for a new mixing element;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a right side view thereof.

The broken lines depict portions of the mixing element that form no part of the claimed design. 

CLAIM The ornamental design for a mixing element, as shown and described. 